Hmmm...the most 'difficult' boa I've ever had was a BCI. I can't help with any first hand experience on the differences between BCC from other locations but I've spent some time with Suriname boas.
All 45ish Suriname boas produced here put on a pretty good show when they are babies (hiss/posture/tail wag/writhe) its damn cute really. They often hiss at their prey before striking (not defensively striking either). One of the babies I held on to this year already lifts his head out of the tub and comes towards movement looking for food and he's only eaten 4 times. His two sisters are drama queens but it will go away pretty fast with them too. Nothing difficult about it for sure..
Neither of my adult Suriname boas have ever struck at me defensively (one is going on 15yo) -they both have tried to eat me during feeding time though. I have a couple of two year olds...neither put on a show.
One thing about Suriname BCC I've noticed is that they never seem quite as at ease when being handled as other boas. They don't do anything surprising but their muscles are just a little more taught like they are 'ready' for something.
If the difficult part related to husbandry, I would say most BCI would benefit from being kept like BCC. BCI are just a little more tolerant of C+ husbandry and C+ husbandry used to be the norm...